function s1_hello() {
   echo "hello,world!"
}
s1_hello
function s2_tell_who_i_am() {
   echo "Enter you name:"
   read user_name
   echo "user name is $uer_name"
}
s2_tell_who_i_am
function s3_which_distro_do_i_use(){
   NAME ="Beta Linux"
   echo $NAME
}
s3_which_distro_do_i_use
function s4_view_my_cpu_arch(){
   uname -m
}
s4_view_my_cpu_arch
function s5_show_first_scsi_disk_size() {
   lsblk -l|\grep disk|\grep'^sda'|awk'{print $4}'
}
s5_show_first_scsi_disk_size
function s6_show main_memory_size_in_megabytes() {
   free -m|grep "Mem:"|awk '{print $2}'
}
s6_show main_memory_size_in_megabytes
